I'll be honest and say I didn't try to puzzle out all of the posts, but I'll make mention of something that no one outright told me for a long time about gender-carried colors in peafowl.
Males are ZZ (think XX like human females) and females are ZW (Think XY in human males).
The gender-chromosome carried colors (cameo, purple, peach... I think sonja's violete?) are the same as any other color in the males, needing 2 copies to be displayed. However, in the females, there is no other Z, so a hen with the cameo genetic coding will necessarily be cameo (and we know it's carried on the Z because the males can be that color and they HAVE no W). She cannot be "split" to cameo because if she has it, she is it.
Similarly, she cannot be split to any other gender-chromosome carried color, because these colors are alleles of one another- this means that the genetic coding for these colors takes up the same space on the chromosome upon which they are carried (think of a car trying to park in the same parking spot as another already parked car. The Cameo car can't park where the Purple car is parked, because the purple car is already there. I'm blatantly ignoring Peach for the moment).
She CAN be split to colors which are NOT carried on the gender chromosome, however, because the genetic coding for those colors are not alleles of the gender carried ones. So a Cameo hen could be split to opal no problem.
The current theory to which Arbor referred to earlier is that Peach is a result of what happens when you "park" purple and cameo in the same bird. The fact that peach birds are produced from matings with cameo and purple birds (I don't claim to know what combination produces this, I admit that peach is one I haven't really had much to do with) suggests that, perhaps, the two genes are both gender linked but perhaps not alleles as previously thought.
I hope that helps clear things up a smidge.